How do I check if my browser has JavaScript enabled?

You normally do this by checking your browser's options. This will
depend on the browser you're using. Instructions for some of the more common
browsers are below:

Internet Explorer:

Go to Tools from the top menu

Select Internet Options

Click on the Security tab

Click Custom Level

Scroll down until you see the Scripting section

Ensure that the Active Scripting option is set at Enable

When the Warning! window asks Are you sure you want to change the
settings for this zone? click Yes

Mozilla Firefox

Go to the Firefox menu

Select Options

Select the Content tab

Check the Enable JavaScript checkbox

Click OK to close the Options window

Google Chrome:

Go to Chrome from the top menu

Select Preferences...

Click on Show advanced settings...Click on Content Settings...

Ensure that the Allow all sites to run JavaScript (recommended) option is
selected

Click OK

Apple Safari:

Go to Safari from the top menu

Select Preferences

Select Security

Ensure that the Enable JavaScript option is checked

Click OK

Opera:

Go to Menu from the top menu

Select Settings

Select Quick Preferences

Ensure that the Enable JavaScript option is checked

Netscape Navigator:

Go to Edit from the top menu

Select Preferences

Select Advanced

Select Scripts & Plugins

Check the Enable JavaScript checkbox

Click OK

Depending on your browser, the exact steps may differ slightly from above.
Having said that, the above steps should point you in the right direction.

Note that you may need to refresh the page after enabling JavaScript before you
see the effect.

How do I disable JavaScript?

You simply go through the steps above but ensure the JavaScript options are not
checked/selected.

If you're developing web pages with JavaScript, it's good practice to view your
website with JavaScript disabled. This will show you what your website will look
like to users who choose to disable JavaScript.

Other browsers?

Most (if not all browsers) give you the option to enable/disable JavaScript. If
your browser is not listed above, the steps above will give you some idea of how
to find it. Just look for something called tools, options,
preferences or something similar.

Warning

Java and JavaScript are two different things - make sure you're
enabling/disabling the right option!